It is named for Peter J. Mezitt, the founder of Weston Nurseries in Massachusetts, the nursery that performed the first hybridization. When it's fully grown, the PJM Rhododendron is compact with a neat, mounded appearance with dense foliage. Most of these plants, especially when they're used in a landscape, grow to heights of about four or six feet, but they can grow to be as high as ten feet tall with a width of about 2/3 of its height.
During the summer months, this plant has elliptical evergreen leaves that are an inch to two-and-a-half inches long. During the winter, those leaves transform into a deep mahogany-purple color. PJM Rhododendron shows its vivid, potent lavender-pink flowers in mid-April and is a reliable bloomer. Because it's a hybrid, most PJM rhododendrons don't seed.